In many streets and neighborhoods residents exchange information via the Internet or in other ways. Comments, complaints and suggestions for improving walking can be part of this seamlessly. See existing groups on WhatsApp, Facebook or www.nextdoor.com.
In several countries you can send your complaints and suggestions to www.fixmystreet.org. Reports are sent to the authorities who can fix the problem.
In The Netherlands the app www.BuitenBeter.nl is in the air. In Eindhoven one can send a photo of the situation by smartphone. As feedback you will receive an email including photos taken before and after the repairing, and an explanation.